|Table of Contents|

Experimental Study on Seismic Behaviors of Prefabricated Connections for Composite Concrete-filled Steel Tubes(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年01期
Page:
44-54
Research Field:
装配式结构
Publishing date:

Info

Title:
Experimental Study on Seismic Behaviors of Prefabricated Connections for Composite Concrete-filled Steel Tubes
Author(s):
ZHANG Yu-fen1; 2;  BU Hong-fan1;  CAO Sheng-xi3;  JIA Hong-xin1
(1. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China; 2. Tianjin Key Laboratory of Prefabricated Building and Intelligent Construction, Hebei University of Technology, Tianjin 300401, China; 3. Norendar International Ltd., Shijiazhuang 050011, Hebei, China)
Keywords:
composite CFST;  blind bolted joint;  T-plate;  ductility;  inner steel tube
PACS:
TU318
DOI:
10.19815/j.jace.2021.03090
Abstract:
In order to study the seismic behaviors of prefabricated connections for composite concrete-filled steel tubes(CFST), five blind bolted joint specimens and one through-bolted joint specimen for composite CFST columns were designed. The horizontal cyclic loading test with end-column fixed was carried out to analyze the influences of ribs and flange thickness of T-plates, beam-to-column stiffness ratio on seismic behaviors including failure modes, load-displacement curves, bearing capacity, ductility, energy dissipation ability, and stiffness degradation etc. The results show that hysteresis loops are full and the energy dissipation ability is strong for blind bolted T-plate joints. Comparing with the joint without ribs on T-plates, the bearing capacity of the joint with single rib on each T-plate increases 39%, and that of the joint with double ribs on each T-plate increases 44%. The joint with 20 mm T-plate flange thickness can improve its bearing capacity by 13% than that with 14 mm T-plate flange thickness, and the ultimate displacement can also be improved. The bearing capacity and energy dissipation ability of the specimen with a large beam-to-column stiffness ratio are improved significantly. The blind bolted joints utilize the advantages of unilateral locking in an inner steel tube, and the inner steel tubes have large strain values, but there is no obvious deformation in the joint core. The joint's force transmission is reliable and the structural integrity is good. Comparing with the through-bolted joint, the initial stiffness of blind bolted joint is slightly lower, and the ultimate bearing capacity is slightly increased. The equivalent viscous damping coefficients of the blind bolted joint and the through-bolted joint are basically the same, while the deformation ability and ductility of the blind bolted joint are significantly increased, indicating that prefabricated blind bolted joints can better guarantee the stability and seismic resistance.

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Last Update: 2021-02-10